<%--
  Created by IntelliJ IDEA.
  User: yaclt
  Date: 2021/12/2 0002
  Time: 11:06
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%
    pageContext.setAttribute("a",1);
    request.setAttribute("a",2);
    session.setAttribute("a",3);
%>
<html>
<head>
    <title>Title</title>
</head>
<body>

    <h1>${a}</h1>
    <h2>request中数据${requestScope.a}</h2>
    <h2>${b}</h2>
    <h1>param${param.b}</h1>
</body>
</html>
